Numerical Modelling Assisted Design of a Compact Ultrafiltration (UF) Flat Sheet Membrane Module

Area of Science:

• Water Treatment Technologies
• Membrane Science and Engineering
• Computational Fluid Dynamics

Background:

• Ultra-low pressure (ULP) membrane systems are crucial for rural drinking water, but module design knowledge is limited.
• Flat sheet membranes offer advantages over hollow fiber membranes in terms of manufacturing, maintenance, and energy use.
• Accurate prediction of ULP system performance requires understanding membrane transport properties and fluid hydrodynamics within the module.

Observation:

• A novel custom flat sheet membrane module was designed and simulated using 3D computational fluid dynamics (CFD).
• The study investigated the impact of spacer geometry, specifically curviness, on fluid flow and permeate flux.
• Parametric analysis explored configuration variables to identify optimal design parameters.

Findings:

• Permeate flux decreased from 2.81 L/m²h (0% curviness) to 2.73 L/m²h (100% curviness) with increasing spacer curviness.
• Spacer inflow or outflow thickness did not significantly influence fluid flow dynamics.
• The CFD model successfully predicted fluid flow conditions and identified key geometrical parameters.

Implications:

• The numerical model provides essential data for designing and fabricating ULP flat sheet membrane modules, especially where technical expertise is scarce.
• Optimizing spacer design can enhance the efficiency and effectiveness of ULP membrane systems for drinking water treatment.
• This research supports the scale-up of lab-scale findings to industrial applications, improving water access in rural areas.